Disc blade



FIG. 1 is a perspective view of an disc blade showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof; and,

FIG. 4 is a right side elevational view thereof.

The broken lines in the drawings illustrate portions of the disc bladeand form no part of the claimed design.

CLAIM The ornamental design for a disc blade, as shown and described.